Central Sense Bulletins
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Central Sense Index
Volume #
Date
Volume 4, Issue 1
10/1/01
Articles
New Propane Low Pressure Kit (LPLP01)
Special Analysis Part(s) Return Tag
Check Home Heating System Before Winter Cold Sets In
Volume 3, Issue 2
4/1/00
InfoFinder Updates
Package Unit Bubble Wrap Packaging
ECM Motor Power Heads
Volume 3, Issue 1 1/1/00
InfoFinder Updates,
Package Heat Pumps and Package Coolers now have external drains,
Defrost Control Board Confusion
New Two-Stage White-Rodgers Gas Valve for 40" 80% & 90% Furnaces
Programming change to the ECM used in PGD48,060C 090, 115, 1402E
Common use of primary limits between40” 80% GCIC115**40 and
GCIC140**50 Furnaces
New Primary Limit Usage on 40” 80% GUICX50 Furnaces
Revision to Standpipe Bag Assembly for 40” 90% GUCA and GCCA and
95% GUVA Furnaces
Heating Orifices for RHA Heat Pumps
Volume 2 Issue 2 7/1/99
New Modular Format for Service Manuals,
Package Heat Pump Loss of Charge Switch,
RTV Sealant in a Pressurized Can,
New Induced Draft Blowers for 40" 80% GUIC, GCIC and GUID Furnaces
New Manual Reset Limits for 80% and 90% Furnaces and Package Gas
Units
Package Heat Pump Condensate Drains
Revised Air Circulator Motors for 40” 80% Furnaces
Replacement Motor Mounting Assembly for 48” 90% Furnaces
Service Replacement Rollout Limits for GUD115X50B Furnaces
Volume 2 Issue 1
4/1/99
Product Quality Reports,
Package Heat Pump Defrost Settings,
New 10 x 8 Blower Assembly for 40" 80% GUI(C,D)070__40 and
GCIC070__40 Furnaces,
Better Application of Blower Compartment Insulation on GUCA and GCCA
Furnaces
New and Improved Integrated Ignition Controls for 40" 80% GUIC, GCIC and
GUID Furnaces
Alternate Horizontal Vent Termination (Dual Pipe) for 40" 90% GUCA and
GCCA Furnaces
40" 90% GUCA & GCCA Furnace Condensate Drain Clamps
Central Sense Index
Volume #
Date
Volume 1 Issue 2
10/1/98
Articles
Revised 80% and 90% Furnace Integrated Ignition Controls to Eliminate Fan
Dropout Noise
Flame Rectification Kit for GUIB & GCIB Furnaces
Future Availability of 50A52 Integrated Ignition Controls for GUIB & GCIB
Furnaces
GE ECM Motors
FTK02A Integrated Ignition Control Part Number Change
Volume 1 Issue 1
1/1/98
90% Furnace Venting Tables
Dirty Socks Syndrome
Norton 271A Igniter
80% Furnace Door Clips
ECM Motors
Sweating CHA Drain Pans
Dewobble Program, Changes to Condenser Grilles on Remotes
Volume 4, Issue 1
October 2001
Amana HAC Technical Services
New Propane Low Pressure Kit
(LPLP01)
Throughout the heating industry we have seen 80% and
90% furnaces soot up due to various reasons, one of
which is due to propane levels in the storage tank dropping to low causing insufficient gas pressure for the
burners to operate properly which in turn causes sooting
in the heat exchanger. A new accessory has been slated
to be released by this fall by Amana for use on our gas
furnaces when converted to propane gas use. This new
kit is known as the LPLP01 and should be used with all
propane gas furnaces installations. The new LPLP01 kit
consists of the following:
•
•
Propane Low Pressure Switch
Switch to Gas Valve Piping
o Close Nipple
o Tee
• Switch to Gas Valve Wiring
o Single Stage Harness
o Two-Stage Harness
• Propane Low Pressure Kit Label
• Wiring Diagram
• Installation Instructions
The following drawing illustrates the LPLP01 in a typical
installation.
Gas Valve
LP Low
Pressure Switch
Special Analysis Part(s) Return
Tag
Occasionally Amana requests parts or products be returned
for analysis, to ensure these parts or products are returned
to the appropriate parties we have released a new “Special
Analysis Part(s) Return Tag”. These return tags are available
from the Technical Services department in Fayetteville, TN.
To prevent mishandling or loss this “Special Analysis Part(s)
return Tag” must be attached to the exterior of the carton
and clearly visible for all parts or units where Technical
Services or Regional Service Manager has requested the
part or unit be returned for analysis. Without this tag it is
very difficult for our receiving department to determine what
is being returned and why.
Along with this part(s) return tag, a copy of the “Return
Authorization” must be attached to the outside of the carton
on any unit or “Readable Copy of Warranty Tag” must be
attached to part(s) being returned for inspection and/or
analysis in order to be properly coded and entered into the
warranty system and proper credit issued to the distributor
or dealer.
Note: All bar code labels on the carton must be removed
before any unit is shipped back to Amana.
Following these return procedures will help to ensure parts
or products are returned to the appropriate party and that
credits are issued with minimal delay.
Tags:
Heating & Air Conditioning
®
Plug from
Gas Valve
(
Temporary
Pressure Tap
Location
)
SPECIAL ANALYSIS PARTS RETURN TAG
Amana Heating & Air Conditioning
1810 Wilson Parkway
Fayetteville, TN 37334
Tee
Gas Supply Line
The LPLP01 will monitor the gas line pressure and will
disable the units’ gas valve if the line pressure drops
below acceptable levels. This kit provides control over the
unit gas valve by routing the gas valve wiring through the
supplied pressure switch. To enable proper fit-up, the
pressure switch kit must be installed before connecting
the gas supply line to the gas valve. For new unit installations, the kit hardware may be fitted to the gas valve while
the gas manifold is removed for LP gas orifice conversion.
For existing installations, the gas valve line must be
disconnected from the gas valve to allow fitting of kit
hardware.
To Whose Attention in Customer Service Dept.
Part No.
Model No.
Serial No.
Mfg. No.
Return Authorization No.
INSTRUCTIONS 1. Only when special parts analysis is required.
F O R 2. Readable copy of warranty tag also attached.
USE 3. Part to be shipped separately from regular returns.
20343501
Heating&Air Conditioning
®
Comfort. Quality. Trust.
Central Sense
Check Home Heating System Before Winter Cold Sets In
Many people are getting ready to turn on the heat for winter. But before turning on the heat, Amana urges homeowners to
have their fuel-burning home heating systems inspected by a qualified service technician. A qualified service technician,
or service agency should inspect the furnace at least once per year. This check should be performed at the beginning of
the heating season. The inspection should include, but is not limited to:
n
Flue Pipe System - Check for blockage and/or leakage. Check the outside termination and the connections at and
internal to the furnace. Any vent found to be corroded or pitted must be replaced. Attention to soundness of joint and
seams is to be given with any repairs or replacement of the vent being performed prior to returning the furnace to
operation. The suitability of the vent size is to be determined by using AGA/GAMA vent tables as a guide for 80%
non-condensing furnaces and the Installation Manual used as the source for the 90% condensing furnaces.
n
Combustion Air Intake Pipe System (Direct Vent Models) - Check for blockage and/or leakage. Check the
outside termination and the connection at the furnace. Attention to soundness of joint and seams is to be given with
any repairs or replacement of the vent being performed prior to returning the furnace to operation. The suitability of
the vent size is to be determined by using the Installation Manual provided for the 90% condensing furnaces.
n
Heat Exchanger - Check for corrosion and/or buildup within the heat exchanger passageways. Remove any loose
scale, which may be evident in the interior of the heat exchanger. A visual inspection using a high-intensity light is
to be performed paying special attention to any seams. It might be necessary to use a carbon monoxide analyzer
when sampling around combustion-type appliances. Carbon monoxide analyzers are also used to locate sources of
CO in homes, and for indoor air-quality assessment.
n
Burners - Check for proper ignition, burner flame, and flame sense. Check the burner flames for good adjustment,
stable soft blue flames and make sure they are not curling, floating or lifting off the burner.
n
Induced Draft and Circulation Blowers – Check for accumulation of dust that may cause overheating and clean
as necessary. On some older model furnaces it may be necessary to oil these motors, all newer model furnaces
have permanently lubricated bearings and do not need oiling.
n
Condensate Drainage System - Check for blockage and/or leakage. Check hose connections at and internal to
furnace.
n
Ductwork – Check both the supply and return ductwork for any signs of air leakage. Make sure the seal between
the furnace and its ductwork is sound with no signs of air leakage. Do not rely upon tape to perform this seal. It may
be necessary to seal the taped duct joints with commercially available joint compound. When possible, a visual
inspection of the interior of the ductwork should be performed and any obstructions to airflow removed.
n
Gas Pressure – Using an incline manometer check the incoming (supply pressure) and outgoing (manifold) pressures.
The supply pressure for natural gas should be between a minimum of 5.0” w.c and a maximum of 10.0” w.c. while
the manifold pressure should be between a minimum of 3.2” w.c. and a maximum of 3.8” w.c. The supply pressure
for LP gas should be between a minimum of 11” w.c. and a maximum of 13.0” w.c. while the manifold pressure
should be between a minimum of 9.7” w.c. and a maximum of 10.3” w.c.
n
Wiring - Check electrical connections for tightness and/or corrosion. Check wires for damage.
n
Filters – Check for proper filter size and also for dirty filters. Remember that dirty filters are the most common
cause of inadequate heating or cooling performance.
These checks will ensure that all furnace components are in proper working order and that the heating system functions
properly to provide efficient and safe operation of the furnace throughout the heating season.
Check the burner flames for:
1. Good adjustment
2. Stable, soft and blue
3. Not curling, floating, or lifting off.
2
Volume 3, Issue 2
April 2000
Amana HAC Technical Services
InfoFinder Updates
InfoFinder is Amana Heating and Air Conditioning’s Electronic Literature
Library. It is a CD Rom that contains all of the Production Literature, Service
Manuals, PDB’s, PMN’s, Warranty’s, and Service Letters, created in
Fayetteville, over the last several years.
InfoFinder seems to be effective in helping Servicers with technical questions. We have seen a tremendous surg in requests for copies of InfoFinder.
We now have over 400 subscriptions! Remember that your dealers may be
interested in copies of InfoFinder, too.
If you do not already have a subscription for InfoFinder you can order it
through Merchandising. Use your Merchandising Order Form to place an
order.
It is easy to install. When you install InfoFinder, please be sure to close all
running programs; any virus software, any fax programs, etc.
If you are not sure all your programs are closed, you can restart your
computer while holding down the “SHIFT” key. When you see the Windows
95/98 splash screen, hold down the “SHIFT” key until your computer is
completely restarted. This prevents any start programs from starting.
Package Unit Bubble
Wrap Packaging
Amana engineers are making some
changes to the packaging of the Amana
Package units. Beginning January 25,
2000, the package units were covered
with “Bubble Wrap”. The bubble wrap
has been found to reduce the incidents
of scratches and scuff on the painted
surfaces of the package units. In the
months ahead, the Amana engineering
staff will develop a completely new packaging system which will provide significant improvements in resistance to shipping and handling damage.
Wrap Around
Unit
Fold Over Top
and Tape to Self
Then, after you have restarted your computer, put the disk in the drive. If your
computer is set for automatic run, it will instal on it’s own. If not, click on your
Windows start button, then run. Click browse then point to your disk drive,
click on InfoFinder Startup.exe.
Be sure to print the “InfoFinder Manual.RTF” file. It gives specific instructions
for using InfoFinder and a discription of any error codes you may see. To print
this file, just click on your Windows start button, then run. Click on the browse
button and point to your CD drive. Double click on the “InfoFinder Manual.RTF”
file, then print.
ECM Motor Power Heads
At last! Amana has set up service part numbers for the power head only (the electronics) for the ECM motors. We are
in the process of getting these parts in the service system and appropriate parts subs in place. Look for a Service Letter
next month identifying the new parts. The new Package Unit and Furnace Service manuals include troubleshooting
information and power head replacement procedures.
®
Volume 3, Issue 1
InfoFinder
Updates
Well, we are off and running
with the release of the
InfoFinder CDs. While there
have been reports of some
“bugs” in the last release
(9904), the current release
(0001) should have no problems.
We are excited about all of the
features InfoFinder has and the
information that it contains.
Now, when you search for a
Service Letter (or Product Marketing
Newsletter)
on
InfoFinder, there are links to
each letter on the left side of
your screen. If you click on
these links, they will take you
directly to the letter of your
choice.
Amana HAC Technical Services
January 2000
Package Heat Pumps and Package Coolers now
have external drains.
Package heat pumps and package coolers (PHB/PHD/PCC) manufactured after
January 1, 2000, will be shipped with an external drain as opposed to the internal drain
system in units manufactured prior to 2000.
The external drain trap will be shipped in a bag inside the unit and must be installed
at the time of installation for proper operation. The change was made to provide for
improved drainage in high static and down shot installations.
Remind your installers that the external drain trap must be installed at the time of
installation.
Defrost Control Board Confusion
Amana RHA**B*A heat pumps manufactured before 11/08/99 (serial number
9911158284 and prior) were built using 20214301 control board. RHA**B*A heat
pumps manufactured 11/08/99 and later were built using 20214302 defrost control
board. The parts manual for the RHA**B2A contains a typo error and indicates only
the 20214302 defrost control.
The 20214302 board improvements include separate hi and low pressure switch
connections and a logic program which ignores the low pressure switch in the defrost
mode to prevent nuisance tripping of the low pressure switch when the heat pump
defrosts the coil in the heat pump mode.
The index pages contain the
letter number, date it was released and a statement regarding the letter’s content. When
you use the index(s) in combination with the links, you can
quickly access letters with the
information you need.
The 20214301 “Defrost Control” will sub to 20300101 “Defrost Board Kit” which
includes instructions, jumpers, wiring diagrams and the 20214302 “Defrost Control”.
We hope you find InfoFinder
an invaluable tool. If you have
any questions regarding the
use or installation of InfoFinder,
you can contact your RTSM.
Service kit (Amana part # 20300101) will replace the 20214301 defrost board used
in the RHA**B*A models
The 20214302 “Defrost Control” will also be incorporated into the new RHE heat
pumps (RHE**A2B) to be released (March 2000) and the Amana Package Heat
Pump models. The defrost control board (Amana part # 20214302) eliminates the
need for a defrost relay used in the current RHE and the RHA**B3A models.
Kits
Service kit (Amana part # 20293901) will replace the 10865005 defrost board used
in the RHE/RHD models. The 20293901 kit contains C6431001 defrost board which
was used in the RHA**A2A models.
New Two-Stage White-Rodgers Gas Valve for 40" 80% & 90%
Furnaces
Amana has recently implemented a change from current Two-Stage Gas Valve with ON/OFF
Knob, Amana Part # C6476906, to White-Rodgers Two-Stage Gas Valve with Electric ON/OFF
Switch, Amana Part # C6476909, on current 40” 90% GUVA furnaces and on 80% GUIS, GCIS
and GUIV furnaces in production. This change should eliminate the need for the servicer to
carry multiple service replacement parts. The new White-Rodgers Gas Valve, Amana part #
C6476909, has been subbed in service parts and can be ordered as a replacement if needed.
®
Central Sense
Programming change
to the ECM used in
the
PGD48,60C090,115,1402E model Package
Gas Units.
Beginning in February 2000, the ECM
motor will be reprogrammed such that if
the “R” line to the motor is turned OFF
the motor will react as though it has
input on the EM/W2 line. The wiring will
be commonized with the PGD2442C_2E, PGB42-60C_2F and PGA
models. These changes allow the removal of the external relay and bracket
as well as simplifying the wiring.
This change brings about some subtle
differences in operation.
Before this change, a blown fuse or
transformer had no effect on the operation of the indoor blower. Now, if the on
board fuse blows, the indoor blower will
start and remain ON until the fuse is
replaced. The motor will behave the
same if the line or load side of the
system transformer opens
The transformer provides 24 VAC to
the DSI control. Therefore, if it opens,
24 VAC signal from “R” will be removed
from the ECM motor, thus forcing it into
the EM/W2 mode of operation. Since
the limit string is in series with the thermostat “R” terminal, the unit will still run
at the heat speed if a limit opens.
Common Use of
Primary Limits
Between 40 80%
GCIC115**40 and
GCIC140**50
Furnaces
In order to decrease the number of
furnace service parts, Amana has conducted testing and approved the use of
primary limit, Amana part # 10728329
(130° F) in place of primary limit, Amana
part # 10728327 (120° F) on 40” 80%
GCIC115**40 furnace without any specification or operational changes. This
part is also used on 40” 80%
GCIC140**50 furnace. This change to
the new primary limit has been reflected
in the new service and parts manuals.
This change took place in production
April 1999.
New Primary Limit
Usage on 40 80%
GUIC115CX50
Furnaces
Amana has conducted testing and
approved the use of primary limit,
Amana part # 10728334 (180° F), without limit baffle, Amana part # 11094802,
on 40” 80% GUIC115CX50 in place of
primary limit, Amana part # 10738304
(190° F) which requires the use of limit
baffle, Amana part # 11094802. This
change to the new primary limit without
use of limit baffle will be reflected in the
new service and parts manuals. This
change is scheduled to take place in
production April 2000.
Revision to Standpipe Bag Assembly for 40
90% GUCA and GCCA and 95% GUVA
Furnaces
Several reports of the long black drain hose (Hose B), Amana part # 20201902,
that is shipped in the standpipe bag assembly, Amana part # 10195509 for
upflow furnaces and Amana part #10195510 for counterflow furnaces, having a
“Kink” in the hose and when installed the kink will not come completely out of the
hose. The kink in the hose causes a condensate drainage problem, which in turn
causes nuisance tripping of the coil cover pressure switch. To correct this
problem Amana has removed the hose from the standpipe bag assembly and
is shipping it separately inside the furnace to prevent the kink in the hose. The
new part number for the standpipe bag assembly for upflow furnaces is part #
10195511 and for counterflow furnaces is part # 10195512. This change took
place in production October 1999. This change to the new standpipe bag
assembly has been reflected in the new parts manuals.
Heating Orifices for RHA Heat Pumps
The RHA**B2A model heat pumps utilize an “Aeroquip” style orifice to meter refrigerant flow in the heating mode. The
heating orifice is not listed in the parts manual. The orifices listed in the parts manuals are the cooling orifices. The chart
below lists the correct heating orifice for the RHA**B2A model heat pumps.
You can use either style “A” of “B” orifices in the RHA**B2A heat pumps
Style "A" orifice
B1443801
B1443829
B1443823
B1443816
B1443815
Style "B" orifice
10017201
10017206
10017207
10017202
10017213
Diameter Inches
0.047
0.054
0.059
0.061
0.078
2
Models
RHA18B2A
RHA36B2A
RHA30B2A
RHA42B2A
RHA60B2A
Models
RHA24B2A
RHA48B2A
Amana HAC Technical Services
Volume 2, Issue 2
July 1999
New Modular Format
for Service Manuals
Package Heat Pump
Loss of Charge Switch
Technical Services is revising the current Service Manuals into a new
modular format that will be much easier to maintain. This new format
separates the servicing and other generic sections from the more model
specific information.
The “Loss of Charge” switch is sometimes
mistaken for a low-pressure switch. It is in
fact located on the liquid line (High side)
and is designed to open only when the
system experiences a loss of refrigerant
charge. On some models of PHB and PHD
“C” series units, it was discovered that
under some unique field conditions, it is
possible for the switch to open and lock out
the compressor. To address this issue,
Amana has released a new pressure switch
with a lower opening pressure. Amana has
conducted extensive test to assure that the
switch will open only in the event of a loss
of system charge and still protect the compressor from operating in a vacuum. The
new “Loss of Charge” switch is Amana part
# C6453313.
The Service Manual will contain information applicable to an entire product
line such as “Remotes”. This includes Product Design, Kits and of course
Servicing.
Model specific information such as specifications, performance data and
wiring diagrams will be placed in individual “Technical Information” manuals
for each product series. This way when new models are added or updates
are required the specific module can be revised without reprinting the entire
service manual as has been done in the past.
The first group of these manuals to be released is the remote products group,
which covers all current design remote products and replaces service
manuals RS6100002 & RS6200002. You will be receiving these manuals in
the next service literature mailing. The furnace product group will follow this,
then the package units product group.
A new literature numbering system has been designed so that manuals
should be arranged in your books in numerical order. Service Letter CAG422-B will provide additional details.
RS6123001
SERVICE NUMBER
SEQUENTIAL MANUAL
NUMBERS
S = Service, P = Parts
PRODUCT LINE
SPECIAL DESIGNATOR
4 = PTAC
6 = HAC
Model Cat 1, 2 & 5 / Type 1
Model Cat 3 & 4 / Type 1, 2 & 3
1 10 - 11 SEER
2 12 - 13 SEER
3 14 - 15 SEER
4 16 - 17 SEER
MODEL CATEGORY
R_6 (HAC)
1) Remote cooling
2) Remoter Heat Pumps
3) Package Units
4) Light Commercial Package
5) Light Commercial Split
6) Furnaces
7) Multiuse Accessory
Model Category
1, 2 & 5 above
1 (CONDENSING UNIT)
2 (BLOWER COILS)
3 (COILS)
9 (ACCESSORIES)
R_4 (PTAC)
2) All
Model Category
3 & 4 above
1 (GAS ELECTRIC)
2 (COOLING)
3 (HEAT PUMP)
9 (ACCESSORIES)
Model Cat 1, 2 & 5 / Type 2 & 3
Model Cat 6 / Type 1, 2 & 3
1 Standard Efficiency
2 High Efficiency
TYPE OF UNIT
Model Category
6 Furnaces above
1
2
3
6
7
9
(90% +)
(80%)
(70%)
(HTM)
(SOURCED)
(ACCESSORIES)
Model Category
7 Multi Use Accessory
1 (ELECTRONIC AIR
CLEANER)
2 (ZONING)
Model Category
PTAC's (R_42)
1 (COOLING)
PTC
2 (HEAT PUMP) PTH
9 (ACCESSORIES)
0 (SERVICE MANUAL
RTV Sealant in a Pressurized Can?
Amana Service Parts has released and is now stocking RTV sealant in a
pressurized container. Amana part # R9900143. We believe this RTV is
cleaner and neater than the old containers and it dispenses in all positions.
We hope you will find it to be a great addition to your technician’s service
truck. The RTV is rated for -60 to 450 degrees and can be use in package
and furnace installations as well as coolers. Currently we only stock white
sealant but other colors could be added to our stock if requested by the field.
New Induced Draft
Blowers for 40" 80%
GUIC, GCIC and GUID
Furnaces
Amana recently implemented a change
from current Induced Draft Blower, Amana
Part # 10585405, to a “C” Frame Induced
Draft Blower, Amana Part # 20044401, on
current 40” 80% furnaces, effective March
1999. The new ID Blowers are backward
compatible with the 105854* series eliminating the need for the servicer to carry
multiple service replacement parts. The
new Induced Draft Blower, Amana part #
20044401, has been subbed in service
parts and can be ordered as a replacement
if needed.
®
Central Sense
New Manual Reset
Limits for 80% and
90% Furnaces and
Package Gas Units
As a quality improvement, Amana has
changed to new manual reset limits.
These new limits have improved contacts which will provide for longer life of
the limits.
This change to the new limits involves
a part number change for each limit
and will be reflected in the new parts
manuals for each model involved. The
new limits will be phased in over the
next few months and are backward
compatible with the previous design.
Revised Air Circulator
Motors for 40 80%
Furnaces
Replacement Motor
Mounting Assembly
for 48 90% Furnaces
This past February 1999, Amana implemented the use of a single flat shafted
motor on GUIC, GCIC, GUID, GUIS and
GCIS model furnaces in prodcution. This
change was made due to field reports of
blower wheel slippage on the motor shaft.
This change will reduce the potential for
the blower wheel to slip on the motor
shaft causing damage to the motor shaft
and wheels.
Occasionally, in some furnace installations the 10x10 blower wheel (Amana
part
#D6723306)
used
on
GUC090X50B,
GUC115X50B,
GUD090X50B, GUD115X50B and
GUX090X50B model furnaces, has
been found to fail at the center plateto-blade interlock. This type of failure
can occur when the motor speed frequency coincides with the resonant
frequency of the system. High duct
static installations will cause the blower
motor to operate at high RPM which
can lead to center plate-to-blade interlock failures.
The Amana Parts department has been
notified of these changes and will sub
to these new parts to coincide with the
effectivity date of each manual reset
limit change taking place in production.
Previous motors used on 80% furnaces
had two shaft flats while the blower
wheels have only one set screw for
mounting. Changing to a motor with a
single flat shaft increases the contact
area between the motor shaft and the
blower wheel hub providing a better fit
and less potential for slippage.
Package Heat Pump
Condensate Drains
This change to the new single flat shafted
motor does not involve a part number
change so when ordering a service replacement motor the servicer will continue to order the same part number
motor as listed in the parts manual for
each model furnace.
The PHB/PHD “C” series package heat
pumps included an improvement in the
condensate drain arrangement over
the PHA/PHB “B” series package heat
pumps, in that they contained a trap
built into the drain tube. Since it’s introduction, Amana has made improvements to the drain tube. Initially the
package heat pumps used a ¾” I.D.
drain tube that would not correctly mateup to a ¾” PVC fitting.
With the change from the PHB**C**D
to the PHB**C**E models, the drain
tube was changed to part # 20222401
which is 1” I.D. and will mate to ¾” PVC
drains. In Oct. 98, we again changed to
part # 20222402 which has a 1/3 thicker
wall, to provide additional support. Service parts has subbed up to the latest
drain tube, if you should require a replacement drain tube, note that you will
receive drain tube part # 20222402,
incorporating the latest improvements.
...increases the contact area between
the motor shaft and
the blower wheel
hub...
In order to reduce the resonance frequency and thereby reduce the center
plate-to-blade interlock failures, Amana
has released a new motor mounting
assembly kit that consists of a stiffer
motor mount and grommets for service use and is also currently being
used on the furnace models listed
above that are still in production. If you
encounter this condition it will be necessary to replace the motor mounting
assembly while replacing the failed
blower wheel to eliminate the potential
for future failures. The new motor
mounting assembly kit can be ordered
from Amana Parts department, the
part number for this kit can be found in
Service Letter GF-145-B.
Service Replacement Rollout Limits for
GUD115X50B Furnaces
There have been a few reports of nuisance rollout limit trips on GUD115X50B
model furnaces in some installations. Amana has conducted testing and determined that this condition can occur under normal conditions and is recommending
a change of the rollout limit if nuisance tripping occurs.
If you encounter this condition replace the 275°F rollout limit (Amana part #
10123509) with new 325°F rollout limit (Amana part # 10123531) to eliminate the
nuisance tripping.
2
Amana HAC Technical Services
Volume 2, Issue 1
Product Quality Reports and
You
You are the single most important
part of the Product Quality Reporting
system (PQR). We rely on field
reports from you and your people to
trigger PQR items and to provide us
with the information to identify and
define PQR issues.
Why do I need to send in a Test Data
sheet with my PQR report?
As we are defining a PQR issue,
sometimes what may initially appear
to be an insignificant piece of data, in
the end, may turn out to be a crucial
piece of information. The point is, we
don't know until all of the facts and in
and the issues defined.
Why do I need to report serial
numbers?
Serial numbers are invaluable in
Product Quality issues. Serial
numbers may help to identify that a
problem exists within a specific date
range. Armed with that information,
we can then look at any changes that
were made in manufacturing or
vendor changes that coincide with the
reported serial number date ranges.
On the other hand, serial numbers
may help to prove that a vendor or
manufacturing change is not related
to the problem, which allow us to
focus our efforts towards other
possibilities, and identify the problem
more quickly.
Do I need to continue to report
incidents, once the PQR is reported?
Absolutely! In many instances, we have
defined the PQR item, but we still need
your continued input to assist us in
determining the scope of the issue or
how many units are involved.
Continuing reports with model/serial
numbers is frequently invaluable
information in determining the nature
of the field program needed to address
the PQR issue.
®
A higher standard of comfort
...Go with your
instincts. If you feel
it is a PQR issue,
then chances are, it
is a PQR issue...
Package Heat
Pump Defrost
Settings
Why do I need to submit the PQR on
an Amana report form?
This is very important! It allows us to
quickly compare reports and data from
different areas of the country, greatly
assisting us in identifying and defining
any issue.
When do I send in a PQR report?
Go with your instincts. If you feel it is a
PQR issue, then chances are, it is a
PQR issue.
Should I send in parts with my PQR
report?
No, hold the parts for 60 days or until
we request the parts to be sent in for
analysis. This allows us to set up a
tracking system for the return parts and
to define exactly what parts we need
returned for analysis.
Remember that Product Quality works
best when we all work together as a
team.
Do you have the current Product
Quality Report form and Test Data
Sheet?
Heating ¡ Air Conditioning
April 1999
If not, contact Kim Whisenant in
Fayetteville for a copy(s) of the current
Product Quality Report form and Test
Data sheets.
The
Amana Package Heat Pumps
are shipped from the factory with the
defrost control set to 60 minutes run
time after the 30/60 control closes.
This is the appropriate setting for most
installations. However, in some
installations, it may be advisable to
change the control's default setting.
For example in areas where the winter
weather frequently reaches high
humidity conditions, it would be
advisable to change the setting to 30
minutes. In areas where the winter
weather is frequently very low
humidity conditions, additional
savings can be realized by changing
the setting to 90 minutes.
By knowing your area and choosing
the appropriate defrost setting for the
local operating conditions, you can
maximize the systems operating
efficiency and performance.
Central Sense
New 10 x 8 Blower
Assembly for 40" 80%
GUI(C,D)070__40 and
GCIC070__40 Furnaces
Presently the GUI(C, D)070__40 and
GCIC070__40 furnaces only produce
3.5 ton of airflow for air conditioning. To
increase the airflow to a full 4 tons for air
conditioning the blower assembly is
being changed from the 10 x 6 blower
currently in use to a 10 x 8 blower
assembly which will take effect by the
end of April 1999. New manufacturing
numbers were released with the above
model furnaces with a 10 x 8 blower
assembly so correct service parts can
be ordered if needed.
The expanded air flow capabilities will
increase the application flexibility of
these furnaces. For the new airflow
information on the above listed furnaces
using the new 10 x 8 blower assembly,
refer to the "Blower Performance Specification Charts" in Product Marketing
News 99PMN04 letter dated April 1,
1999 along with revised specification
sheets and service manual for these
units.
New and Improved
Alternate Horizontal Vent
Integrated Ignition Controls Termination (Dual Pipe) for
for 40" 80% GUIC, GCIC and 40" 90% GUCA and GCCA
GUID Furnaces
Furnaces
Amana is in the process of changing
Ignition Controls from the WhiteRodgers 50A50, Amana Part #
10207710 to the White-Rodgers 50A55,
Amana Part # 10207709 for current
GUIC, GCIC and GUID furnaces. This
change in production will take effect by
the end of April 1999.
The 50A55 ignition control is also used
on the new 40" 90% GUCA and GCCA
model furnaces. The White-Rodgers
50A55 ignition control has an adaptive
timing that adjusts the duration of the
ignitor warm-up, to extend ignitor life.
Upon initial application of power, the
warm-up time is 17 seconds. The ignitor on-time will then be adjusted depending on whether or not flame is
achieved. The new ignition control,
Amana part # 10207709, has been
subbed in service parts and can be
ordered as a replacement if needed.
Better Application of Blower Compartment Insulation on
GUCA and GCCA Furnaces
One of the new features of the GUCA and GCCA 40” 90% furnaces was the
addition of tough skin insulation in the blower compartment. This insulation quiets
the overall furnace operation and helps to prevent sweating in high humidity
applications. Unfortunately we received some reports that the insulation was not
fully adhering to the furnace cabinet. However with continual feedback from our
customers (YOU) we were able to quickly improve our manufacturing processes
and in February 1999 several changes were made to improve the application of
glue and eliminate this problem.
There have been several requests for
an alternate vent termination on the flue
pipe for the GUCA and GCCA model
furnaces installed in a horizontal application. Again we listened and immediately went to work developing and testing different vent terminations.
The result of this is a vent termination
very similar to that used on the GUD
model furnaces as seen in the illustra-
VENT
90°
MEDIUM
RADIUS
ELBOW
12" MIN
24" MAX
24" MAX
3" MIN
AIR
INTAKE
SCREEN
12" MIN
tion. Our testing indicated that we can
use elbows on one pipe installations
with no sacrifice in vent lengths. Elbows
can be used on two pipe installations
(Dual Pipe) with a 10' sacrifice in vent
lengths. The new table listing both tee
and elbow terminations can be found in
Service letter GF-143-S dated January
7, 1999, along with revised installation
instructions and service manual for
these units.
These new venting table gives the dealer
the option of using a tee termination or
elbow termination when installing these
units in a horizontal application.
40" 90% GUCA & GCCA Furnace Condensate Drain Clamps
There have been a few reports that the condensate drain spring clamps, Amana part # M0119207, did not adequately secure
the drain tubes. Although these are the same clamps and hoses used in 48" 90% furnaces, Amana investigated a different
clamp and made a change due to concerns of possible condensate leakage. In January 1999, Amana changed to a new
condensate hose clamp part # M0119205 to provide a more resilient clamp and prevent any possibility of condensate
leakage. This new condensate drain clamp, Amana part # M0119205, has been subbed in service parts and can be ordered
as a replacement if needed.
2
Volume 1, Issue 2
Re
vised 80% & 90%
Revised
Furnace Integrated
Ignition Contr
ols to
Controls
Eliminate F
an Dr
opFan
DropOut Noise
Occasionally, in some furnace installations, when the
thermostat was set for continuous fan operation and
then called for cooling, the integrated ignition control
would operate the air circulation blower for 5 seconds,
stop the air circulation blower
for ¼ to ½ second, and then
resume normal operation.
When this situation occurred,
there was a slight fan bump
noise from the air circulation
blower
which
some
homeowners found objectionable. To eliminate this situation, revisions were made to
the hardware and software of
the White-Rodgers 50A50288, Amana part number
10207706, and Heatcraft
HSI-1, Amana part number
11184501, integrated ignition
controls. With the implementation of the new hardware
and software revisions, there
are new part numbers for
these controls. The new
Amana part number for the
White-Rodgers 50A50-288
ignition control is 10207710
and the Heatcraft HSI-1 is
11184502. These revised integrated ignition controls
were
made
available from service parts
March 3, 1998.
Amana HAC Technical Services
October1998
Flame Rectification Con
ver
sion Kit ffor
or GUIB & GCIB
Conver
version
Furnaces
The White-Rodgers 50A52 ignition
control used on GUIB and GCIB
furnaces is being discontinued by
the manufacturer. Therefore
Amana has developed a flame rectification conversion kit to convert
these models to GUIA type flame
proving system. This kit, Amana
part number 20224301, consists of
White-Rodgers 50A50 integrated
ignition control, flame sensor,
adapter harnesses (2), installation
instructions and a replacement wiring diagram.
Note: Please make sure that when
GUIB or GCIB furnaces are converted to the flame rectification
flame proving system, that the new
wiring diagram is placed over the
old wiring diagram and that the
conversion label is installed to denote that the furnace has been converted to a flame rectification flame
proving system. This information
on the flame rectification flame
proving conversion kit can be found
in Service Letter GF-140-B dated
October 20, 1998.
Future A
vailability of 50A52 Integrated Ignition Contr
ols
Av
Controls
for GUIB & GCIB Furnaces
Due to the future availability of the White-Rodgers 50A52 ignition control used
on the GUIB and GCIB model furnaces, it was necessary for Amana to do a
last time buy of these controls in order to provide future service replacement
parts. The ignition controls purchased were a newer control with updated software, requiring a new part number for these controls. The previous part number was 11003101, which subs to new part number 11003102. Listed below
are the four software differences in these controls (all other operations are
unchanged):
1. Change from a 17 second igniter warm-up time to a 12 second igniter
warm-up time.
2. Change from 90 second flame sensing time to a 30 second flame sensing
time.
3. Change from one ignition attempt to three ignition attempts before lockout,
which by making this change from one to three ignition attempts creates a
60 second interpurge that was not present with the one ignition attempt.
4. Change from no cool off delay to a 90 second cool off delay.
The use of this newer ignition control should provide greater reliability and
service from the GUIB and GCIB model furnaces. The two most important
added features are the decreasing of the igniter
on time to increase igniter life and the change from
®
one to three ignition attempts before lockout.
Heating ¡ Air Conditioning
A higher standard of comfort
1
Central Sense
G.E. ECM Motor
s
Motors
General Electric Industrial Division
provided a great training class for many
of the participants of the Amana
Technical Service Managers Meeting.
For those who were unable to attend the
meetings or missed the G.E. classes.
We felt the information was well worth
repeating. The following is some of the
highlights of the ECM Diagnostics class.
The complete trouble shooting manual
may be obtained from Technical
Services as an Adobe Acrobat file.
Troubleshooting Do’s and Don’ts
DO
• Check out motor controls, wiring and
connections thoroughly before
replacing motor.
• Orient connectors down so water
can’t get in.
• Install “Drip Loops”.
• Use authorized motor and control
model numbers for replacement.
• Keep static pressure to a minimum.
Recommend high efficiency, LOW
STATIC filters.
• Recommend keeping filters clean.
• Design ductwork for minimum static,
maximum comfort.
• Look for and recommend ductwork
improvement where applicable.
• Size the equipment wisely.
DON’T
• Automatically assume the motor is
bad.
• Locate the connectors above the 7
and 4 o’clock positions.
• Replace one motor or control model
# with another (unless an authorized
replacement).
• Use high pressure drop filters (some
filter have 0.5” W.C drop!!!).
• Use restricted returns.
• Oversize system, then compensate
with low airflow.
MOISTURE CHECK
• Connectors are oriented “Down”
• Arrange harness with “Drip Loop”
under motor.
COMFORT CHECK
• Check proper airflow settings
• Low static pressure for lowest noise
• Set low continuos-fan CFM.
MOTOR ROCKS SLIGHTLY WHEN
STARTING
• This is normal start-up for ICM
MOTOR WON’T START
NO MOVEMENT
• Check power at motor.
• Check low voltage (24VAC R to C) at
motor
• Check low voltage connections
(G,,Y, W, R, C) at motor.
• Check for unseated pins in
connectors on motor harness.
• Test with a temporary jumper
between R-G
• Check motor for tight shaft.
• Perform motor/control replacement
check.
• Run Moisture Check.
• Check for loose or compliant motor
mount.
MOTOR ROCKS, BUT WON’T START
• Make sure blower wheel is tight on.
• Perform motor/control replacement
check.
MOTOR STARTS,
ERRATICALLY
BUT
RUNS
VARIES UP AND DOWN OR
INTERMITTENT
• Check line voltage for variation or
“sag”
• Check low voltage connections (G,
Y, W, R, C,) at motor, unseated pins
in motor harness connectors
• Check “Bk” for erratic CFM
command (in variable speed
applications) Check- out system
controls – THERMOSTAT?
• Check low voltage (T’stat) wires and
stays at low CFM despite system call
for connections cool or heat CFM
• Verify fan is not in delay mode - wait
until delay complete
• “R” missing/not connected at motor.
• Perform motor/control replacement
check “R” missing/not connected at
motor.
STAYS AT HIGH CFM
• Is fan in delay mode? – Wait until
delay time is complete.
EXCESSIVE NOISE
• Determine if it’s air noise, cabinet
noise, duct noise, or motor noise.
Interview customer if necessary.
AIR NOISE
• High static is creating high blower
speed?
• Is airflow set properly?
• Does removing filter cause blower to
slow down?
• Check/replace filter.
• Use low pressure drop filter.
• Check/Correct duct restrictions.
NOISY BLOWER OR CABINET
• Check for loose blower housing,
panel, etc.
• High static creating high blower
speed?
• Check for air whistling through
seams in ducts, cabinets or panels.
• Check for cabinet/duct deformation.
“HUNTS” OR PUFFS” AT HIGH CFM
(SPEED)
• Does removing panel or filter reduce
“puffing.”
• Reduce restriction.
• Reduce max airflow.
MOTOR FAILURE OR
MALFUNCTION HAS OCCURED
• Replace motor and perform Moisture
check.
• Evidence of moisture present
• inside air mover
• Perform Moisture check.
CAUTION: Disconnect power from
unit before removing or replacing
connectors, or servicing motor.
Wait at least 5 minutes after
disconnecting power before opening
motor.
FTK02A (Furnace Twinning Kit) Integrated Ignition Contr
ol P
ar
e
Control
Par
artt Number Chang
Change
The White-Rodgers 50A50-207 integrated ignition control, Amana part number 10207703, used in Amana’s
furnace twinning kit FTK02A has been discontinued by the manufacturer. Therefore a new control has
been released to replace it. The new Amana part number is 10207711Q (50A50-295). This new ignition
control was made available from service parts February 5, 1998.
2
Volume 1, Issue 1
The return of
“Central Sense”. During the life of any
product numerous
changes and improvements take place.
Some are major requiring a model
change, others are
more subtle requiring
only a Manufacturing
number change. while
others are simply
product improvements, vendor
changes, etc. that are
90% Furnace Venting Tables
S
everal of you have requested
90% furnace venting tables
with more than 4 elbows and
lengths greater than 40 feet. Well
we came through, in Service letter
GF-135-B dated
October
14,
1997. We extended the tables
to 8 elbows and up to 90 feet of vent
pipe.
Previous tables showed a maximum of four 90° elbows and a
maximum length of 40 feet.
In addition to expanding the tables,
Amana adjusted the diameter of
pipe that is required. Amana also
invisible to most peoVent
Type
neering and manufac-
1
turing groups. What
2
we hope to do is bring
3
important changes to
10 to 15
Feet
15 to 20
Feet
20 to 25
Feet
25 to 30
Feet
30 to 35
Feet
35 to 40
Feet
40 to 45
Feet
45 to 50
Feet
50 to 55
Feet
55 to 60
Feet
60 to 65
Feet
65 to 70
Feet
70 to 75
Feet
Inlet
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
3"
3"
3"
3"
Exhaust
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
3"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
3"
2"
3"
2"
2"
2"
2"
2"
2"
2"
2"
2"
2"
3"
2"
3"
2"
3"
2"
2"
2"
2"
2"
2"
2"
2"
3"
2"
3"
2"
3"
2"
3"
2"
2"
2"
2"
2"
2"
3"
2"
3"
2"
3"
2"
3"
2"
3"
3"
2"
2"
2"
3"
2"
3"
2"
3"
2"
3"
2"
3"
3"
3"
3"
2"
3"
2"
3"
2"
3"
2"
3"
2"
3"
3"
3"
3"
NA
NA
2"
3"
2"
3"
2"
3"
2"
3"
3"
3"
3"
NA
NA
NA
NA
2"
3"
2"
3"
2"
3"
3"
3"
3"
NA
NA
NA
NA
NA
NA
2"
3"
2"
3"
3"
3"
3"
NA
NA
NA
NA
NA
NA
NA
NA
2"
3"
3"
3"
3"
NA
NA
NA
NA
NA
NA
NA
NA
NA
NA
Inlet
Inlet
Exhaust
Inlet
Exhaust
5
Inlet
Exhaust
6
Inlet
Exhaust
your attention so you,
7
the Service Manager,
8
Inlet
Exhaust
Inlet
Exhaust
are better equipped to
serve your customer.
Inside Feet of Straight Pipe
5 to 10
Feet
Exhaust
4
these minor but often
expanded the use of the 2” venting pipe to additional applications.
To clear up any misunderstanding
that may arise in the field, the
tables for the direct vent (two pipe)
systems show total length of run
for each pipe used in the system.
Again, the revised venting tables
can be found in Service Letter GF135-B dated October 14, 1997
along with Product Marketing
News 97PMN12 dated October
15, 1997. Amana is currently in
the process of adding the revised
venting tables to installation instructions and service manuals.
Vent and Combustion Air Pipe Diameter for GUD045, GUD070
Direct Vent (Two Pipe System)
# of
Inside
Elbows
ple outside of the engi-
January 1998
HAC Technical Services
Norton 271A Igniter
Thus the “Central
Sense” bulletin has
been reborn.
As a quality improvement aimed
at extending igniter life, Amana
has added a new low-amp element to the Norton Igniter assembly 10041601 used in service part
D9918202A. With the implementation of the new element, a
new Amana part number was
issued for the Norton 271A igniter assembly. The new number
is 10041602. The revised igniter,
became available October 1997
for use by service parts in the
igniter assembly D9918202A.
Dirty Socks
Syndrome
“D
irty Socks Syndrome” as it
is typically known in the
industry is the smell associated
with a bacterial growth that can
occur on the indoor coil of a heat
pump system. This odor absorbed
from the air passing over the indoor coil can come from bacterial
growth in the duct system, cooking
odors from the kitchen, pets etc.
The odor is typically noticed at the
end of a defrost cycle when the
moisture accumulated during the
defrost cycle evaporates off the coil
releasing the odor often described
as a “dirty sock “ smell. This
condition is not the result of a design or
manufacturing defect
3"
3"
NA
3"
3"
NA
However, Amana has
3"
NA
NA
3"
NA
NA
provided in the past
NA
NA
NA
dichromated coils to
NA
NA
NA
NA
NA
NA
eliminate complaints
NA
NA
NA
NA
NA
NA
of “Dirty Socks SynNA
NA
NA
NA
NA
NA
drome”.
UnfortuNA
NA
NA
nately,
current
EPA
NA
NA
NA
NA
NA
NA
regulations
are
makNA
NA
NA
NA
NA
NA
ing it nearly impossible to find a company still willing
to dichromate coils. As a result,
Amana will no longer offer dichromated coils for the treatment of
“Dirty Socks Syndrome”. To help
assist you in rectifying the situation,
Amana has evaluated products
from Controlled Release Technologies and recommends treating the
coil with “MD HVAC” System
75 to 80
Feet
80 to 85
Feet
85 to 90
Feet
(Continued on page 2)
®
Heating ¡ Air Conditioning
1
A higher standard of comfort
Central Sense
(Continued from page 1)
sanitizer, immediately followed by an application of “First Strike Micro-Coat.”
These chemicals can be purchased directly
from “Controlled Release Technologies” at
1-800-766-9057.
We also recommend kit DS-1 or DS-PG
for cleaning as these kits include instructions and all the chemicals needed to treat
one system. The DS-PG in particular includes an additional chemical to help eliminate any bacteria which may be present in
the drain pan.
In some cases, this treatment process may
need to be repeated annually.
mana has recently implemented the
use of two wire door clips, Amana
tine and break the interlock switch. With
the use of the two new wire clips the
bottom door can be removed without the
top door sliding down and breaking the
interlock switch. The new wire door clips
were made available November 1997.
ECM Motors
providing additional resistance to
moisture induced electrical shorts.
This process was implemented
10/28/97.
A
s a rule ECM motors have been
very reliable. The single highest
cause of ECM motor failure is
condensate “pooling” or collecting
inside the ECM motor and causing
an electrical short circuit. Over 90%
of all ECM motor failures can be
prevented if the installers position the
motor to allow proper drainage of any
condensate which forms in the area.
This
means
in
counterflow
applications the motor must be
rotated so the arrow is pointing up. In
horizontal installations, the motor
part number 10833601, to all 40”, 80%
must have air space between the
furnace chassis assemblies to prevent the
insulation and the motor. The motor
top door from sliding
cannot be buried
down and breaking
in the insulation.
the interlock switch. “...the bottom door was
The
GOOD
The problems that removed first allowing
NEWS is GE has
have been reported the top door to slide
implemented a
from the field were
dipping process
created when the bot- down like a Guillotine
to
coat
the
tom door was re- and break the interlock
board’s power
moved first allowing switch.”
switching leads
the top door to slide
and inside of the
down like a Guillomotor body; thus
A
80% Furnace
Door Clips
Sweating CHA
Drain Pans
O
ccasionally in some high humidity
conditions with low indoor airflow you may receive reports of evaporator drain pan sweating. If this applies
to you, we have a fix. Closed cell foam
tape, part number 20177201, is available from the Amana Parts department.
This foam tape, part number 20177201,
can be applied to the bottom of the coil
basepan to insolate the pan from the
airstream thus greatly reducing the likelihood of sweating.
If a BBA or BBC two piece airhandler
is installed in these same conditions you
may get reports of cabinet sweating at
the joint where the blower section and
the coil section meet. This same foam
tape can be applied to the flange on the
inside of the cabinet to eliminate heat
transfer through the sheet metal flange.
Dewobble Program, Changes to Condenser Grilles on Remotes
M
uch effort has been put into improving the stability of Amana’s remote products. There have been several grille design changes
as well as additional gasketing and shipping supports added that you need to be aware of.
Our research indicates the primary cause of the instability or “Wobbling” is the compressing of the condenser fins in shipping or storage
of the product; therefore several of these changes are related to carton or shipping and are not readily apparent. But we wanted you to
know.
1/2/97 Denoted by a manufacturing
number change, on all remote models, the
coil grille, top panel, and basepan were
changed to move the grille tie rods from the
center of each side, out to the corners for
increased stability. Also, the coil grille tie
rods were decreased in length to allow for a
tighter fit of the coil between the top and
bottom of the unit. This minimizes the
movement of the coil between the two surfaces.
7-1-97 - 10/6/97 A “running” change was
made to the condenser coil grilles to further
improve the sound quality of the unit. This
change involved moving the top and bottom
horizontal wires on the grille so they no longer
contacted the top panel or basepan.
10/13/97 Added gasket (1148702 &
10839817) to top of coil. Adding gasket to the
top and bottom of the coil allows for a tighter
tolerance and further minimizes the movement
2
of the coil between the top and the
basepan.
11/11/97 Two additional corner post were
added to shipping assemblies for a total of
four corner posts on all size remotes. This
action addresses the warehouse issues of
leaning stacks. The added corner posts
greatly improved the carton strength resulting in less compression of the fins
during shipping, storage,, and handling.